Symplocos rubiginosa is a tree in the family Symplocaceae, native to Southeast Asia. The specific epithet rubiginosa means 'rust-coloured', referring to the indumentum.
Symplocos rubiginosa grows up to 30m (100feet) tall, with a trunk diameter of up to . The brown bark is smooth. The leaves are obovate to elliptic and measure up to long. The inflorescences feature spikes, each bearing up to ten white flowers. The ovoid fruits are blue when ripe. The hard timber is locally used in house construction.
Symplocos rubiginosa is native to Peninsular Malaysia, Borneo and Sumatra. Its habitat is kerangas, dipterocarp and montane forests, often by rivers, at elevations of .